MODULE IV
Condensing boiler technology Page 51

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Exercise 15



Value comparison table given an annual condensate quantity of
VK = ..................... l/a
Substances/
elements
Maximum permitted (limit) values according to the drinking water regulation Actual measured values of condensing boiler systems
mg/a
g/a
mg/a
g/a
Lead 100 0,100 < 5 < 0,005
Chrome 125 0,125 < 5 < 0,005
Nickel 625 0,625 < 5 < 0,005


Important result of the discussion: The quantities of heavy metal elements that are going to be introduced into the public sewage systems are well below the permitted limit values.



Exercise 16




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Technical parameters/characteristic values for fuels


1) Conversion factor: 1MJ = 0,2778kWh


English translation of technical terms and sentences of the diagram above:
     
Brennstoffgruppe = Fuel group
Brennstoff = Fuel
Wärmewert = Energy values
Verbrennungsluftbedarf = Combustion air requirement
Brennwert Ho = Calorific value
Heizwert Hu = Heating value
VLmin = Minimum air requirement for the stoichiometrical combustion (complete combustion)
Feste Brennstoffe = Solid fuels
Anthrazit = Anthracite coal
Braunkohle = Brown coal
Braunkohlebriketts = Brown coal briquettes
Holz, luftgetrocknet = Wood, air-dried
Stroh, luftgetrocknet = Straw, air-dried
Torf, trocken = Dry peat
Zechenkoks = Coke
Flüssige Brennstoffe = Liquid fuels
Heizöl EL = Fuel oil EL
Heizöl S = Fuel oil S
Kerosin = Kerosene
Petroleum = Petroleum
Brennwert Ho,n = Calorific value in standard state/condition
Heizwert Hu,n = Heating value in standard state/condition
Ho,B = Calorific value in operating condition (Operating calorific value)
Hu,B = Heating value in operating condition (Operating heating value)
Gasfamilie (S) = Gas group (S)
Stadtgas = City gas
Ferngas = Gas supplied over long distances
Gasfamilie (N) = Gas group (N)
Erdgas H = Natural gas H
Erdgas L = Natural gas L
Gasfamilie (F) = Gas group (F)
Propan = Propane
Butan = Butane
Gasfamilie (L) = Gas group (L)
Flüssiggas-Luft-Gemisch = Liquid gas-air-mixture
Erdgas-Luft-Gemisch = Natural gas-air-mixture


Operating heating Hu,B and operating calorific values Ho,B are published by the corresponding gas supply company. The operating heating value Hu,B is necessary for the adjustment of a gas burner according to the so called "volumetric method".



 

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